Open Access Repository

Documenting demise? Sixteen years observing the Swift Parrot Lathamus discolor in suburban Hobart, Tasmania

Hingston, AB 2019 , 'Documenting demise? Sixteen years observing the Swift Parrot Lathamus discolor in suburban Hobart, Tasmania' , Australian Field Ornithology, vol. 36 , pp. 97-108 , doi: 10.20938/afo36097108.

Full text not available from this repository.

Abstract

The Swift Parrot Lathamus discolor is listed as Critically Endangered because modelling suggests that its population is declining by > 80% within three generations (12-18 years) as a result of just one of many factors impacting the species: predation by introduced Sugar Gliders Petaurus breviceps. Unfortunately, verification of this prediction through monitoring of the entire population across its breeding range is difficult because of the amount of observer effort required to count all individuals within the often dense canopies of Eucalyptus trees, where it forages predominantly from flowers. This study entails 16 years of opportunistic observations at a single location within this species’ breeding range. Regression models indicated that over 16 breeding seasons the mean size of the largest flock per month declined by ∼90%, and grand mean size of all flocks per month by ∼70%. This was not the result of decreasing local flowering intensity in the Swift Parrot’s favoured food plants, as adjusting the two measures of abundance for local inter-annual variation in flowering had little effect on the rates of decline. This concordance between observations at the local scale and modelling of the entire population supports the findings of the modelling, suggesting that urgent action is required to prevent extinction of this species.

Item Type: Article
Authors/Creators:Hingston, AB
Keywords: threatened species, population, foraging
Journal or Publication Title: Australian Field Ornithology
Publisher: BirdLife Australia
ISSN: 1448-0107
DOI / ID Number: 10.20938/afo36097108
Copyright Information:

Copyright 2019 BirdLife Australia

Related URLs:
Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page
TOP